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Notably Range Extension of Sturnira Aratathomasi Peterson and Tamsitt 1969 in Perú

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Notably Range Extension of Sturnira Aratathomasi Peterson and Tamsitt 1969 in Perú Short Notes 561 Notably range extension of Sturnira aratathomasi Peterson and Tamsitt 1969 in Perú VÍCTOR PACHECO and PETER HOCKING Departamento de Mastozoología, Museo de Historia Natural, Universidad Nacional Mayor de San Marcos, A.P. 14-0434, Lima-14, Perú; E-mail of VP: [email protected] Key words: Sturnira aratathomasi, distribution, Perú, Apurímac, the Andes, dry forests INTRODUCTION S. aratathomasi indicate it inhabits the premontane and montane life zone from The genus Sturnira is one of the most 1,650 to 3,165 m a.s.l. (Soriano and Molina- speciose genus of Neotropical bats. Cur- ri, 1987; McCarthy et al., 1991; Alberico et rently, no less than 15 species are recog- al., 2000). nized (Pacheco and Patterson, 1991, 1992; Here, we provide information on the Koopman, 1993; Iudica, 2000; Sánchez- specimens from San Martín and report on Hernández et al., 2005; Simmons, 2005). three additional specimens from the Depart- Among them, the Aratathomas’s yellow- ment of Apurímac, extending the southern shouldered bat Sturnira aratathomasi and range of the species more than 840 km. the greater yellow-shouldered bat, Sturnira magna, are the two largest species of the MATERIALS AND METHODS genus; however, the former is one of the less known species in the genus. Most of the A distributional map of S. aratathomasi is pre- specimens of S. aratathomasi come from sented, with all records mapped using ArcView 3.2 on the Northern Andes, where as few as 18 an altitude map developed by WorldClim, version 1.4 specimens are known from Mérida state, (Hijmans et al., 2004). Coordinates were taken from Tamsitt et al. (1986), Alberico (1987), Soriano and Venezuela (Soriano and Molinari, 1984), Molinari (1987), McCarthy et al. (1991), Paynter the departments of Cauca, Caldas, Huila (1997), CastaZo et al. (2003), and Lehr et al. (2004). and Valle del Cauca, Colombia (Tamsitt et The report of Solari et al. (2001) was based on al., 1986; Soriano and Molinari, 1987; Al- two specimens (MUSM 7305, 7306) captured at Las berico 1987, Alberico et al., 2000; CastaZo Palmas, ca. 32 km NE de Pataz, Department San Mar- et al., 2003), and from Ecuador (Peterson tín, at 2,000 and 2,100 m a.s.l. (ca. 07°34’12.65’’S, 77°17’50.64’’W). The specimen MUSM 7305 was and Tamsitt, 1968). The presence of S. ara- captured on 19 July 1990 in montane forest, and it is tathomasi in Ecuador is based on two spec- a male with testes 4 × 3 mm; whereas the specimen imens collected from an unknown locality MUSM 7306, sex undetermined, was captured on 21 before 1874; since then, no other specimen August 1990 at riverine vegetation, near the river. has been recorded for that country (Albuja, Other species captured at the lower montane forest of 1999; Tirira, 1999). Las Palmas were: Anoura caudifer, A. geoffroyi, Ca- rollia brevicauda, Platyrrhinus ismaeli, P. nigellus, McCarthy et al. (1991) reported the Sturnira bidens, and S. erythromos (Velazco, 2005; first specimen of S. aratathomasi from M. Romo, personal comm.). The lower montane for- Perú based on a juvenile male specimen est of Río Abiseo is characterized by the appearance (LSUMZ 21484) mist-netted on 29 August of palms (Chamaesorea poeppigiana and Prestoea 1978, east of La Peca, at 3,165 m in the acuminata), cyclanths (Asplundia moritziana, and Cordillera Colán, Department of Amazonas. Sphaeradenia steyermarkii), other trees (e.g., Case- aria nigricolor, Cecropia sp., Cestrum spp., Clusia Later, the species was also reported from spp., Ficus spp., Oreopanax spp.), and by the absence Río Abiseo, Department of San Martín (So- of tree ferns and the bamboo Chusquea scandens lari et al., 2001). The reported specimens of (Young and León, 1988, 1991). 562 Short Notes RESULTS DISCUSSION The three specimens reported here, were Soriano and Molinari (1987) argue mist-netted at Cconoc (ca. 13°32’47”S, against Thomas and McMurray (1974) 72°38’39”W, elevation 1,925 m), Depart- suggestion that S. aratathomasi might be ment of Apurímac, on 8 May 2002 by P.H., a common species at higher elevations. at the border of the Río Apurímac. This A plot of all localities versus elevation sup- place is a forest dominated by trees of Pro- ports Soriano and Molinari (1987) because sopis juliflora, Acacia macracantha, Schi- all (22 specimens with elevation data), ex- nus molle, Eriotheca discolor, and other xe- cept four, were collected from 1,650 to rophytic elements such as columnar cacti 2,200 m, at the lowest limit of its altitudinal and Parkinsonia praecox, which character- range. Capture data from mistnetting are not ize a typical dry forest of interandean val- a reliable method for obtaining abundance, leys (Fig. 1). This record appears to be the but we suggest that the range between 1,650 first time the species is captured in dry for- to 2,200 m appears to be the optimal range est habitats. The capture effort was only six for the species. mistnet-night, and no other bat species were The examined Peruvian specimens agree captured in the same place. The specimen in external pelage coloration with the type MUSM 19153 is a female with develop- description and other specimens collect- ed teats suggesting a lactating condition; ed so far. The San Martín specimens have whereas the other two ones (MUSM 19151, a clear brownish tone whereas the Apurímac 19152 — Fig. 2) are male adults but lack re- specimens are a composite: two specimens productive data. have the grayish tone (both males) and the FIG. 1. Dry interandean forest in Cconoc, 1,925 m a.s.l., at the border of the Río Apurímac, Department Apurímac, Perú, where S. aratathomasi was collected Short Notes 563 The external and cranial measurement of the San Martín and Apurímac specimens (Table 1) agree with the data reported else- where (Peterson and Tamsitt, 1968; Thom- as and McMurray, 1974; Soriano and Mo- linari, 1987). The palates of all Peruvian specimens examined here present also sev- eral small cavities of irregular shape, size, and distribution (Soriano and Molinari, 1987), and appears to be distinctive for the species. Peterson and Tamsitt (1968) stated that the lower incisors of S. arata- thomasi are bifid, but Pacheco and Pat- FIG. 2. A male individual of S. aratathomasi (MUSM terson (1991) scored the middle lower inci- 19152) collected from Cconoc sors of the holotype as trilobed, similar to the score of McCarthy et al. (1991) based other the clear brownish one (female). The on a juvenile specimen (LSUMZ 21484). noseleaf, lips and orbicular ring are con- The Peruvian specimens examined here spicuously dark in the Apurímac specimens. have also the middle lower incisors tri- The epaulettes are absent in all specimens. lobed, and the outer lower incisors bilobed, TABLE 1. Summary statistics for external and craniodental measurements (in mm) and body mass (in g) of S. aratathomasi from the departments of San Martín (n = 2) and Apurímac (n = 3), Perú, compared with the holotype specimen (USNM 395158) San Martín Apurímac Parameter Holotype1 0 ± SD Min–Max 0 ± SD Min–Max Body mass2 – 52.5 ± 7.07 47.5–57.5 47.7 ± 2.08 46.0–50.0 Head and body length 101.0 81.5 ± 10.61 74–89.0 91.7 ± 2.89 90–95.0 Hind foot length 21.0 18.3 ± 0.35 18.0–18.5 18.7 ± 0.29 18.5–19.0 Ear length 21.0 22.0 ± 0.00 22.0–22.0 20 ± 0.00 20.0–20.0 Forearm length 59.0 58.4 ± 0.42 58.1–58.7 57.3 ± 1.61 55.5–58.6 Metacarpal length of 3rd digit 57.0 54.1 ± 1.06 53.3–54.8 54.7 ± 0.20 54.5–54.9 Length of 1st phalanx of 3rd digit 21.0 20.9 ± 0.85 20.3–21.5 21.6 ± 1.13 20.7–22.8 Length of 2nd phalanx of 3rd digit 28.5 28.1 ± 0.78 27.5–28.6 28.3 ± 0.40 27.9–28.7 Greatest skull length 29.6 28.1 ± 0.37 27.8–28.3 27.7 ± 0.33 27.3–28.0 Condylobasal length – 26.2 ± 0.71 25.7–26.8 25.7 ± 0.51 25.1–26.0 Condylocanine length – 25.4 ± 0.52 25.1–25.8 24.8 ± 0.37 24.4–25.1 Palatal length – 11.4 ± 0.35 11.2–11.7 11.5 ± 0.16 11.3–11.6 Maxillary toothrow length 8.3 7.9 ± 0.27 7.7–8.1 7.9 ± 0.11 7.9–8.1 Zygomatic width 17.7 17.1 ± 0.32 16.8–17.3 16.8 ± 0.10 16.7–16.9 Braincase width – 13 ± 0.00 13.0–13.0 13.1 ± 0.07 13.0–13.1 Lacrimal width 8.5 8.3 ± 0.06 8.3–8.4 7.9 ± 0.09 7.8–8.0 Postorbital width 8.2 7.3 ± 0.00 7.3–7.3 7.5 ± 0.10 7.4–7.6 Palatal width at second molar – 9.6 ± 0.00 9.6–9.6 9.7 ± 0.08 9.6–9.8 Palatal width at canines 8.7 8.1 ± 0.28 7.9–8.3 7.8 ± 0.09 7.7–7.9 Dentary length 18.0 18.0 ± 0.23 17.8–18.2 17.8 ± 0.34 17.4–18.1 Mandibular toothrow length 9.2 8.8 ± 0.08 8.7–8.8 8.7 ± 0.12 8.6–8.9 Coronoid height – 7.2 ± 0.00 7.2–7.2 7.1 ± 0.10 7.0–7.2 1 — Data from the holotype specimen was taken from Peterson and Tamsitt (1968) 2 — Variables are described in Peterson and Tamsitt (1968), and Pacheco and Patterson (1992) 564 Short Notes and that appears to be typical for the species range extends farther south to species.
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